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However, emerging electrophysiological evidence indicates mechanistic differences between cervical and lumbar tSCS and across different cervical tSCS paradigms. To clarify these discrepancies, we developed and validated a multi-scale, whole-body computational model of tSCS-induced volume conduction, axonal recruitment, and synaptic transmission. Across 24 cervical and four lumbar tSCS paradigms, simulations showed that somatosensory afferents consistently exhibit lower stimulation thresholds than motor efferents. In turn, region-specific synaptic transmission differences may explain electrophysiological discrepancies between cervical and lumbar tSCS. Across cervical tSCS paradigms, substantial volume conduction and axonal recruitment differences were observed that explain electrophysiological discrepancies. Specifically, clinically-prevalent paradigms, including those with anodes placed over the clavicles or iliac crests, engaged peripheral nerves in addition to spinal roots. This effect was amplified by multiphasic waveforms, which introduced recruitment sites near the anodes. By integrating simulations with electrophysiological recordings in 14 able-bodied individuals, we investigated previously unexplored cervical tSCS paradigms on their capacity to recruit somatosensory afferents relative to motor threshold.<\/jats:p>","DOI":"10.64898\/2026.01.22.701010","type":"posted-content","created":{"date-parts":[[2026,1,25]],"date-time":"2026-01-25T03:15:13Z","timestamp":1769310913000},"source":"Crossref","is-referenced-by-count":2,"title":["Virtual prototyping of non-invasive spinal cord electrical stimulation targeting upper limb motor function"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-4645-5788","authenticated-orcid":false,"given":"Abdallah","family":"Alashqar","sequence":"first","affiliation":[{"name":"Department of Medical Informatics, Biometry and Epidemiology, Friedrich-Alexander-Universit\u00e4t Erlangen-N\u00fcrnberg, Erlangen 91052, Germany"},{"name":"Department of Artificial Intelligence in Biomedical Engineering, Friedrich-Alexander-Universit\u00e4t Erlangen-N\u00fcrnberg, Erlangen 91052, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2862-8356","authenticated-orcid":false,"given":"Nabila","family":"Brihmat","sequence":"additional","affiliation":[{"name":"Univ. 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